A once-in-10-year storm is spreading freezing rain, sleet and snow across Texas, Louisiana and Mississippi on Tuesday.
"From the Baton Rouge, La., to Mobile, Ala., area, some snow will mix in at the end of the storm, but the main concern is sleet and freezing rain that will lead to extremely treacherous travel and possible power outages," AccuWeather Senior Meteorologist Kristina Pydynowski said. "Bridges and overpasses will be the first to turn icy."
The wintry weather will continue to expand eastward across Georgia, South Carolina, North Carolina and the mid-Atlantic coast through Tuesday night.
Hazardous travel will span the heavily traveled I-10 and I-95 corridors.
Early Tuesday, 620 arriving and departing flights had been canceled in Houston at George Bush Intercontinental Airport as clouds, rain and an icy mix expanded into the region, according to Flightstats.com.
More than than arriving and departing 1,600 flights have been canceled at Hartsfield-Jackson Atlanta International Airport ahead of the storm.
Schools closed on Tuesday in many locations across the South, including in Houston, New Orleans and Mobile, Ala.
UPDATES (All times are listed in Eastern Time):
6:50 a.m. EST Tuesday: Bridges on Highway 61 near Vicksburg, Miss., are covered by sleet and ice, according to the Emergency Manager.
6:00 a.m. EST Tuesday: Law enforcement in Brookhaven, Miss., reported dense fog and freezing rain in the area at the time of a car accident.